50-250 usd
A Winchester Model 140 12 gauge, semi automatic can be worth up to $150. The exact amount that the Winchester is worth depends on the condition of the gun.
I bought a Winchester ranger 140 for $220 in awsome shape at a pawn shop that deals mainly with guns near St. Louis
They only made the Winchester 140 Ranger from 1964-1968.
67-73
The Winchester 140 12 gauge has a choke barrel at 28". This is the same choke size as the 20 gauge model.
I do not believe that the serial numbers for the Winchester model 140 ranger,semi-auto shotgun are in the public domain.I can say that the Winchester model 1400 was made from 1964-1981,and this was the higher priced version of the model 140 ranger shotgun.
Your Winchester ranger model 140 was made from 1967-1973.Winchester did not keep serial number records of this model of shotgun.
Best to ask a gunsmith for help
late 60s to early 70s
If you have enough money, someone can do it.
The Model 140 is a cheaper varient of the 1400